You do know how to tekk weapons correctly, right?
I see a lot of incorrectly tekked weapons in your list.
http://wiki.pioneer2.net/index.php?title=Tekking
Anyway, I'll take the Heart of Kapu Kapu for a pd.
Now that you said "possibly a bit more" motherfuckers gonna hit you with high offers and pretend to walk if you don't take it lol - V502 is always 25, it's hidden in the name backwards and separated by a 0 (and the 0 stands for spend 0 more than 25)
For http://wiki.pioneer2.net/index.php?title=Vol_Opt
Or am I mistaken in thinking machine% on a non-fast casting weapon is useful? The explanation in the link isn't 100% crystal clear to me.